package com.kuang.add;

import java.util.concurrent.CountDownLatch;

/**
 * Author: Zhang Dongwei
 * Date: 2022/3/13 15:21
 * 计数器
 */
public class CountDownLatchDemo {
    public static void main(String[] args) throws InterruptedException {
        // 总数是6， 倒计时, 必须要执行任务的时候，再使用
        CountDownLatch countDownLatch = new CountDownLatch(6);

        for (int i = 1; i <= 6; i++) {
            new Thread(()->{
                System.out.println(Thread.currentThread().getName()+"Go,走了");
                countDownLatch.countDown(); //数量-1
            }, String.valueOf(i)).start();
        }
        countDownLatch.await(); //等待计数器归零，然后再向下执行
        System.out.println("close door");
    }
}
